<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<script src="myModule.js"></script>
<script src="myModule2.js"></script>
<script>
   const  myModule1 = myModule()
   myModule1.upCase()
   myModule2.lowCase()
</script>
</body>
</html>